Apparatus for identifying paper money or the like, as genuine, and for making changeor the like



Aug. 30, 1960 L T|MM$ 2,951,164 I R. APPARATUS FOR IDENTIFYING PAPERMONEY OR THE LIKE, AS GENUINE, AND FOR MAKING CHANGE OR THE LIKEOriginal Filed Feb. 7, 1952 3 Sheets-Sheet l Powze IN DEL/V58 FIG. I

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R. L. TIMMS 2,951,164 APPARATUS FOR IDENTIFYING PAPER MONEY OR THE LIKE,AS GENUINE. AND FOR MAKING CHANGE OR THE LIKE Original Filed Feb. 7,1952 S Sheets-Sheet 2 .FIG.3

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APPARATUS FOR IDENTIFYING PAPER MONEY OR THE LIKE, AS

GENUINE, AND FOR MAKING CHANGE OR THE LIKE. Original Filed Feb. 7, 19523 Sheets-Sheet 3 F IG. 7 1200/256CENC5 77:57"

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APPARATU FUR IDENTIFYING 'PAPER MONEY OR THE LIKE, AS GENUINE, AND FORMAKING CHANGE OR THE L aired Original application Feb. 7, 1952, Ser. No.270,326.

Divided and this application May 20, 1958, Ser. No. 736,627

'6 Claims. (Cl. 250-219) This invention relates to apparatus :foridentifying paper money as genuine, and, more particularly, for makingchange, for performing a vending function, for counting the paper money,and the like.

This application is a division of my copending application bearing thesame title, filed February 7, 1952, under Serial No. 270,326, and, morespecifically is concerned with light reflective and fluorescence testapparatus shown in Figs. 6 and 10 of said parent application.

it is well known to vend various merchandise automatically bycoin-controlled apparatus. However, the average purchaser of merchandiseor services does not carry, and ordinarily cannot conveniently get asufiicient quantity of metal coins so as to extend the range of thevending equipment to a monetary value approaching or above a dollar. Forexample, before making from a pay phone a long distance telephone callwhich may cost several dollars or more, it is necessary for the callerto fill his pockets with quarters or other metal coins, and Sometimes nosource for coins is available near the pay telephone which the callerwishes to use, and even if a cigar counter or other source of change isavailable, the change is often given grudgingly or not at all.

As a result, the automatic vending of merchandise or services abovetwenty-five cents or so has been complicated by the potential customerslack of metal coins, and the vending of merchandise and services ofhigher price, for example of one dollar or more, has been decidedlyhandicapped.

The determination of genuine metal coins has progressed in the art tothe point where known devices are Very satisfactory, but so far as I amaware, no automatic apparatus is available for discriminating betweengenuine and spurious paper currency. Metal coins are, of course, muchmore stable than paper money which becomes dirty, moisture-laden, foldedand wrinkled to materially complicate automatic determination.

It is the general object of my invention to avoid and overcome theforegoing and other difiiculties of and objections to prior artpractices and limitations by the provision of relatively simple, easilyoperated, self-contained automatic apparatus for receiving andidentifying as genuine a piece of paper money, followed by the per-'formance of a function, such as the making of metal coin change for thepaper money, the vending of merchandising or service, the vending of amerchandise or service plus the making of change, or by the counting ofthe paper money.

Another object of my invention is to provide in apparatus of thecharacter described an oldness test which may take the form of areflected light determination from which data can be derived concerningthe newness or oldness of the paper money so that determinations of thegenuineness of the bill can be reached and also the genuineness limit ofsubsequent tests can be rear- 2,951,164 Patented Aug. 30, .1960

ranged to compensate to handle either a new or an old piece of papermoney. 7

Another object of my invention is the provision of radiation and colortest apparatus for paper money and including an examination of moneywith ultra-violet light and pick-up means for measuring the reradiationand color of the paper money under the ultra-violet light.

The foregoing objects of my invention, and other objects which willbecome apparent as the description proceeds, are achieved by theapparatus about to be described, typical embodiments of which areillustrated in the accompanying drawings, wherein:

Fig. l is a diagrammatic and schematic illustration in vertical section,in part, of one embodiment of the assembled test apparatus of myinvention;

Fig. 2 is an enlarged fragmentary vertical cross-sectional view, takensubstantially on line II-II of Fig. 1 and showing the paper money orbill receiving slide of the apparatus of Fig. 1;

Fig. 3 is a fragmentary top plan view showing the inner end of the papermoney or bill receiving slide of Fig. 2;

Fig. 4 is an enlarged fragmentary vertical cross-sectional view, takensubstantially on line IV-lV of Fig. 1, and illustrating the belts andpulleys for conveying the paper money or bill through the test apparatusof Fig. 1;

Fig. 5 is a diagrammatic illustration, partially in verticallongitudinal section, of a reflected light type of test apparatus;

Fig. 6 is a view of a typical mechanism for efiecting the repositioningof test limits in a later test apparatus by a modulated output from anearlier test apparatus;

Fig. 7 is a view similar to Fig. l of typical color and reradiationtesting apparatus of my invention.

The term paper money has been largely used heretofore in referring tothe article or articles to be identified by my testing apparatus, andthis term is intended to include paper currency of all sizes,denominations, and countries of origin, and, in addition, to includebonds, documents, or other paper, textile, or colored articles whichmight be subjected to test for genuineness, Weave, composition, gloss orthe like, by equipment of the character herein described and claimed.However, the apparatus of my invention is primarily designed for thedetermination of genuiueness of United States paper money in lowerdenominations, for example, one-dollar, five-dollar, and ten-dollarbills. In order to shorten the designation of the article being testedit has been designated in the drawings as a bill and will be sodescribed in the specification.

General combination Having reference to Fig. 1 of the drawings, thenumeral .10 indicates a casing it), largely broken away and housing thetest apparatus of the invention. The front end of the casing it as shownin Figs. 1, 2 and 3, is provided with opposed horizontally positionedchannels 12 which slidably receive a slide 14 to which a frame 16 issecured. The frame 16 defines at three sides a space adapted to receive.a bill B shown in exaggerated thickness in Fig. 2, the bill beingadapted to be held in flat position within the frame 16 by a lid 18hinged to the slide 14 adjacent its outer end. The innermost corners ofthe slide 14 and lid 18 are cut away at 20, as seen in Fig. 3 so thatcorners B of the bill B stick out in the manner indicated in dash-linesin Fig. 3.

When the slide 14 with bill therein is pushed into the casing 10 againstthe compression springs 22, the end of the slide 14 strikes a startingswitch 24, of the self-locking type, to connect a power-in circuit 26 tonormally closed relay 28 to drive a motor 30. In order to pick up thebill B from the slide and to carry it 3 through the apparatus, suitablemechanism is provided which includes a drive connection from. motor 30to a shaft 32 geared by means (not shown) to a shaft 34 positionedparallel to and vertically above shaft 32. Shaft 32 carries a pair ofpulleys 36, and shaft 34 carries a pair of pulleys 38, and the puileys36 are in alignment with pulleys 4% carried on a shaft 4-2, and thepulleys 38 are in alignment with pulleys 44 carried on a shaft 46 whichis positioned above and parallel to shaft 42. The pulleys 3.6 and 40carry a pair of suitable belts, such as Vrbelts 48, and pulleys 38 and44 carry a second pair of belts, usually V-belts St].

Fig. 4 illustrates that the pulleys 4t) and 44 and V- belts t) and 43carried by the pulleys are positioned in association with the end of theslide 14 so that as it is moved by the customer into the casing to firststart the drivingmotor 39, as described, the corners B of the bill aremoved into the bight of the V-belts 48 and 5! whereby the end of thebill is gripped and progressively pulled out of the slide and into agripped position between the belts. The stretches of the V-belts 48 andSt) between the spaced pulleys are supported by small pulleys or rollersdesignated by the numeral 52 throughout the figuresof the drawingsillustrating the individual pieces of testing apparatus, it beingunderstood that the additional supporting rollers 52 are employed inopposed or in mere supporting relation wherever it is found necessary ordesirable upon the stretches of the V-belts.

In the manner described, the bill B is conveyed by the belts 48 and 50to and through one or more tests which may include oldness testapparatus 54, thickness test apparatus '56, electric resistance testapparatus 62, and matching test apparatus 64.

It may be desirable to subject the bill B to a drying and pressingaction prior to passing it to any one of the test a paratus. This ispreferably accomplished by positioning one or more pairs of heatedroilers 66 on opposite sides of the bill in its travei between thepulleys 4t and 44 and the first piece of test apparatus. If only adrying action is desired, the heated rollers 66 may be replaced withinfra-red lamps or other suitable heating means adapted to bring thebill to a desired moisture content condition. Flow of electric currentto the rollers 66 may be cut off automatically by a relay 67 after theyhave performed the desired pressing and drying operation.

It will be seen that the various pieces of test apparatus areelectrically connected with the power-in circuit 26 so that they areenergized to perform their respective test operations. The output of theseveral test apparatus 54, 56, 58, 6d, 62, and 54 are electricallyconnected to a stepping switch 63 which is adapted to be advanced onestep each time the bill B successfully passes a test. The steppingswitch can be set so that it connects the power-in circuit 26 to anoperating solenoid 76 when a selected number of the tests are passed bythe bill B being examined. For example, if six tests are performed onthe bill B the stepping switch 68 may be set to operate on the sixth tapof the stepping switch and only after the bill B has successfully passedeach test with the stepping switch being advanced one stop or tap aftersuccmsful completion of each test. On the other hand, I particularlycontemplate that if the bill B successfully passes some lesser number ofthe tests to which it is subjected, for example, say four or five of thetests, that the stepping switch 68 will be advanced only to the fourthor fifth tap, but this will be connected with the power-in circuit 26 sothat the solenoid '79 is operated.

I have found, in this connection, that i am able to distinguishcounterfeit from genuine bilis by a series of tests of the characterherein described even though the genuine bill does not pass every testto which it is subjected, even though the counterfeit bill may pass oneor even more of the tests. Each test not only serves to perform itsfunction, but acts together with other tests to define a true line ofdemarcation between the genuine and a counterfeit bill. Of course, Ilikewise contemplate using a smaller number of tests than the numberherein shown and described, and this is particularly true when the testsare employed which have been found to be most excellent indistinguishing between genuine and counterfeit bills. With certain ofthe test apparatus as hereinafter described a single test has been foundto distinguish substantially between genuine and man terfeit bills. Inany event, it is the teaching of my invention as herein disclosed thatthe commercial embodin ent of my apparatus may include any one or moreof the tests and testing apparatus described, with the stepping switch68 being connected to operate if the bill being tested successfullypasses the test or a selected number of the tests to which it issubjected.

Assuming that the bill B being tested has successfully passed theselected number of tests to which it is subjected and that the steppingswitch 68 has connected the powerin circuit 26 to operate the solenoid70, the operation of the solenoid 70 throws a gate '72 from thefull-line position shown in Fig. l to the dotted line positionillustrated and the bill B falls into a drawer or compartment 74 adaptedto receive genuine bills. If the bill B has not passed the required testor tests, the gate 72 is not operated and the bill B after passingpulleys 38 and 36 falls into a reject chute or return passage 76. Returnbelts may be provided, if desired, to return the rejected bill to thefront of the casing 10.

In the passage of the bill B from the last test apparatus to the pulleys36 and 38, the front edge of the bill contacts a tripping switch 73which operates through the normally closed, time response relay 28 torelease the self-locking starting switch 24 so that the driving motor 30comes to a stop and the apparatus is thus returned to its initialinoperative position. It will be understood that when switch 78 isclosed by the front edge of the bill striking it, the time delay featureof the relay 28 causes it not to open until after a sufficient timedelay so that the bill is carried on out from between the pulleys 36 and38 to fall either into the genuine bill compartment 74 or into thereject chute 76. Perhaps I should also make clear that after the bill Bhas been introduced into the apparatus in the manner previouslydescribed by the customer it is necessary that the slide 14 be held inthe casing for a period of several seconds, but then the customer canrelease the slide 14 so that it is automatically pushed out to itsoriginal position by means of the compression springs 22 previouslymentioned.

It will be recognized that various functions can be performed by thebill-identifying apparatus described. For example, the power in circuit26 can be connected by the stepping switch 68 not only to the solenoid70 but to a make change apparatus 3%, to a deliver-merchandise apparatus82, to a deliver-merchandise plus change apparatus 84, or to some otherapparatus 36, such as a counter mechanism. More specifically, if adollar bill has been identified by the apparatus of my invention, themake change apparatus 30, of which there are various known types, can beadapted to deliver to the customer four quarters, ten dimes, or anyother desired combination of metal coin change equaling the value of thebill examined. Or the deliver-merchandise mechanism 32. can be adaptedto deliver a dollar's worth of merchandise or service to the customer,and mechanism of this type is likewise known. Still again, the mechanism84 can be actuated to deliver merchandise plus metal coin change to thecustomer, for example, an eighty-nine cent article-plus eleven cents inchange. Or other mechanism 86, for example, a counter can be actuated,and particularly it might be noted that when actuating simple mechanism,such as a counter, that the number of tests employed in the apparatuscan be reduced and mechanism can be associated with the front of the ,vbelts 38 and 50 for continuously feeding bills into the apparatus.

It may sometimes be desirable to photograph the users of the apparatus,for example, in case of an outbreak of attempts to falsely obtain moneyor merchandise from the apparatus. Thus, I may incorporate a moviecamera 87 in the apparatus in a position to take a picture of the userof the apparatus, a few frames of movie film being taken of each user bya relay 88 and operating solenoid 89 connected in the circuit to motor30. The relay 88 is of the tripping type which fires for a short timeinterval only and automatically resets itself.

Reflected light test apparatus The test apparatus of Fig. 5 is, in oneembodiment or application of the principles of my invention, anothertype for testing oldness or relative deterioration of a bill, thisapparatus being of the reflected light type and including a bill Bgripped between V-belts 48 and 50, and with supporting rollers 52 beingshown in opposed relation for aligning and supporting the V-belts.

The apparatus includes a light source 136 positioned at an angle, forexample 45, with the surface of the bill anddirecting a light beamthrough a lens or a lens system 138 and a shield 140 having an opencenter 142 against the surface of the bill. The reflected light from thebill passes through a lens or a lens system 144 to a photo cell pick-up146 connected to an amplifier 148. A low-power-in circuit 98 isconnected through a microswitch 159 which is normally open and through anormally closed micro-switch 152 and through a galvanometer 154 to alow-power-out circuit 128.

The term galvanometer, galvanometer unit, or meter, is used throughoutthe specification and claims to denote any type of suitable responseelement capable of actuating control circuits in proportion to the inputapplied thereto.

The meter 154 has a plurality of arcuately-short contacts 156 positionedin slightly separated arcuate alignment with each other and adapted tobe engaged in turn by the needle or arm 157 of the meter. Each one ofthe contacts 156 is connected through a different resistance 158 withthe low-power-out circuit 128. The output of the amplifier 128 isconnected to the coil 160 for moving the arm 156 of the meter.

It should be noted that the various components in the test apparatusherein described and to be described, such as light source 136 andamplifier 148 in Figure 5, may all be simultaneously energized byadditional contacts on starting switch 24, Figure l, or may beindividually energized as the bill B passes into each test along itspath through additional contacts on the various switches such asmicro-switch 150, Figure 5. The choice would depend upon warm-up timerequirements, the number of tests being employed, and the consequentlength of time the various components would be energized without beingused.

In the operation of the apparatus of Fig. 5 as the front edge of thebill B moves into engagement with the microswitch 150 to close it, thelow-power-in circuit 98 is connected to the low-power-out circuit 128through the needle 157 and one of the contacts 156 and its associatedresistor 158. The position of the needle 157 on the meter 154 isdetermined by the amount of light reflected from the bill B, the lightpassing from the light source 136 through the lens system 138 againstthesurface of the bill, back through the lens system '144 and into thephoto-cell 146. The amount of light is measured by the photo-cell andthe output of the photo-cell passing to the amplifier 148 produces acurrent flow in themeter coil 160 connected to the output of theamplifier to position the needle 157 of the meter 154. The position ofthe needle 157 thus determines the amount of voltage flowing in thelow-poWer-out circuit 128, and this voltage is proportional to theamount of light reflected from the bill.

I preferably position the micro-switch 150 and the light-producing andpick up mechanism so that the bill is examined on a normally whiteportion thereof lying, for example, to the left of the center picture ofthe bill and above or below the bill center so as to stay away from anypossible creases in the bill and away from any printing on the bill.Usually the older the bill is, the dirtier is the white portion of thepaper of the bill and the less is the output of the amplifier 148 sothat the needle 157 of the meter 154 is towards the left side of theseries of contacts 156 forming its scale. Dependent upon the positioningof the resistors 158, the voltage flowing in the low-power-out circuit128 can be either low for an old bill and successively higher forprogressively newer bills, or vice versa.

In the test of Fig. 5 on the bill B, it is evident that the bill is notstopped in its travel with the belts 48 and 50, although it could be ifdesired. The positioning of the normally open micro-switch and thenormally closed micro-switch 152, together with the positioning of thelight source and the photo cell, determines the portion of the billsubjected to this test. The closing of microswitch 15a) initiates thetest, and the test is stopped as the front edge of the bill strikes themicro-switch 152 to open it and terminate the flow of electric currentfrom the loW power-in circuit 98 to the low-power-out circuit 128.

The test on the bill accomplished by the apparatus of Fig. 5 can be usedto operate stepping switch 68 if the bill being tested is Within therequired limits, but more often, the apparatus of Fig. 5 is utilized toreposition the limits of other test apparatus hereinafter to bedescribed in order to compensate for the oldness or deterioration of thebill being tested. By way of example only, and illustrative of what Imay do with the voltage modulated or determined low-power-out circuit128g reference should be had to Fig. 6, in which I have illus trated thelow-power-out circuit 128 connected to a solenoid which has its plungersecured to a contact plate, such as contact plate 172 (or contact plate290 of Fig. 7), the other end of the contact plate being connected to atension spring 174. The solenoid 170 has a portion of its plunger formedas a ratchet rack 176 with an electrically released locking pawl 178being provided to hold the solenoid plunger and contact in the positionto which it has moved by the voltage in the low-power-out circuit 128.The electrically released pawl 178 is released when the self-lockingstarting switch 24 is opened after the test run of the bill has beencompleted.

It should be noted that if the results of the reflected light test falloutside the selected limits that no compensating bias or resetting ofthe limits of subsequent tests will take place. This failure ofcompensating bias may be used directly to reject the bill being testedor the subsequent compensating tests may be relied upon tobeing testedbeing required to pass a selected number of these tests before beingaccepted.

photo cell. in determining the genuineness of a document than the testwithout a Polaroid screen, and the output of the test with the Polaroidscreen can be used to operate the-- stepping switch 68.

Color and radiation test apparatus The apparatus of Fig. 7 tests forcolor and reradiation,. and in this test the bill B can either bestopped for thetest, for example, with means such as previously de--scribed, or the bill can be continuously moved with the test mechanismonly functioning to measure over a limited area or areas of the billbeing tested, for example, by the use of the on and olf micro-switches15% and 152 of the test apparatus of Fig. 5.

More specifically, this test apparatus of Fig. 7 might likewise bedesignated as fluorescence test apparatus in that it includes an ultraviolet light source 270 positioned at an angle, such as an angle of 45with the surface of the bill B. The ultra violet light from the source270 passes through a filter or a filter system 272 and a lens or a lenssystem 274 before it strikes the surface of the bill, and with thereflected light or reradiation from the fluorescence of the bill passingat a similar angle, for example 45, through a lens or a lens system 276,a Polaroid screen 278, and a filter or a filter system 286 to a photocell pick-up 282.

The output of the photo cell 282 is connected to an amplifier 284 and.its output is connected to the operating coil 286 of a galvanometer 283having an arcuately short contact plate 2% adapted to be engaged throughthe arc of the contact plate by the needle 292 of the galvanometer. Alow-power-in circuit 98 is connected through the contact plate 290 andneedle 292 to the operating coil of a time response relay 294 which whenactuated for the proper time closes or fires to operate the lowpower-out circuit 198 to operate stepping switch 68. Contact plate 296can be arcuately repositioned by the oldness test apparatus, aspreviously described, if desired.

However, in series with the operating coil of the relay 294 are normallyopen micro-switch 296 and normally closed micro-switch 298 adapted to beengaged in turn by the front end of the bill B. The position of themicro-switches 296 and 298 is such that the bill B is examined forfluorescence on one or more areas of the bill, and I have found thatthis test is most elfective when performed upon the seal area of theUnited States currency and upon a white portion of the bill. A secondpair of micro-switches, like switches 296 and 298, can be utilized toget a separate response from a second portion of the bill, or as aboveindicated, the bill may be stopped in turn to take first a reading onthe seal area and second on a white area of the bill.

The ultra violet light source 27d, as employed in one particularembodiment of my invention, employed a socalled small wave length ultraviolet light, ca. 3650 light passing to the photo cell 232 wasdetermined by rotating the Polaroid-I film screen 278, and with thisposition of the film designated as the perpendicular, the Polaroidscreen was turned to angles of 45 and 90" from the perpendicular. It wasdiscovered that the best results were obtained with the Polaroid screen278 at 90 from the perpendicular, which was found to cut out extraneouswave lengths and improperly reflected light, and very excellent resultswere then obtained in distinguishing between genuine and counterfeitbills.

While in accord with the patent statutes, I have particularlyillustrated and described certain best known embodiments of myinvention, it is to be particularly understood that I am not to belimited thereto or thereby.

I claim:

l. The combination in oldness test apparatus for paper money and thelike of a light source, means for moving the money to be tested relativeto the light source to position the light source to dh'ect a. beam oflight against the money, photo cell means for picking up the lightreflected from the money, amplifier means connected to the output of thephoto cell, galvanometer means having its operating coil connected tothe output of the ampliher, a plurality of short arcuate contact plateson the galvanometer means adapted to be engaged in turn by the needle ofthe galvanometer means, a different resistance connected to each contactplate, a power-in circuit triggered by the selected relative position ofthe money and light source and connected through the needle, contactplates and resistances of the galvanometer means to a power-out circuit.

2. Fluorescence test apparatus for documents such, as paper money andthe like including a small wave length ultra violet light source, slidemechanism for receiving the document, conveyor mechanism to position aselected portion of the document to subject it to the light of the lightsource, filter means associated with the light source to restrict thewave length of light emitted, photo cell means for picking up the lightreflected from the document and the fluorescence created thereon by thelight source, narrow band pass filter means positioned between thedocument and the photo cell means and capable of passing only a narrowband of frequencies and within the range generated by a genuine piece ofpaper money when struck by the small wave length ultra violet light,mechanism associated with the photo cell means for indicating the lightpickup by the photo cell means, and contact means operated by theindicating mechanism when the amount of light is within preselectedupper and lower limits.

3. in apparatus for determining as genuine paper money and the like,fluorescence test apparatus including an ultra violet light source,positioning means adapted to receive the money arid to position aselected portion thereof so as to subject it to the light of the lightsource, photo cell means for picking up the light reflected from themoney and the fluorescence created on the money by the light source,Polaroid screen means positioned between the money and the photo cellmeans, said screen being turned in its own plane to and held at an angleto pass a minimum of light to the photo cell means, narrow band passfilter means positioned between the screen and the photo cell means topass only a narrow wave length of light frequencies to the photo cellmeans indicating means associated with the photo cell means forindicating the light picked up thereby, contact means operated by theindicating means when the amount of light is within preselected upperand lower limits, and control means for positioning the money so as totest it on a printed portion and on an unprinted portion thereof.

4. In a device for indicating the genuineness of paper money and thelike, fluorescence test apparatus including a small wave length ultraviolet light source of a Wave length of about 3650 A.U., means forreceiving the money, means for effecting relative movement between thelight source and the money receiving means to position a selectedportion of the money in the light of the light source, filter meansassociated with the light source to restrict the wave length of lightemitted, photo cell means for picking up the light reflected from themoney and the fluorescence created on the money by the light source, anarrow band pass filter means positioned between the money and the photocell means and capable of passing only a narrow band of frequencies andwrthm the range generated by a genuine piece of paper money when struckby the small wave length ultra violet light, Polaroid screen meanspositioned between the money and the photo cell means, said screen beingturned 1n its own plane to an angle about from that passing a maximum oflight to the photo cell means, means associated with the photo cellmeans for indicating the light p cked up by the photo cell means, switchmeans operated by the indicating means when the amount of light s withinpreselected upper and lower limits, a time responsive relay operated bythe switch means when the switch means are closed for a preselectedtime, and means for positioning the money for tests on a printed portionand on an unprinted portion thereof.

5. In apparatus for determining the genuineness of documents, such aspaper money or the like, comprising a light source, means for efliectingrelative movement between the document and the light source toilluminate a desired spot on the document, a light responsive means topick up the light reflected from the document, a Polaroid screenpositioned between the document and the light responsive means andturned in the plane of the screen to and held in a position to reduce tosubstantially a minimum the amount of the light picked up by the lightresponsive means, filter means between the screen and the lightresponsive means and capable of passing only a narrow band offrequencies and within the range generated by a genuine document whenstruck by the light source and an output circuit adapted to be energizedif the amount of reflected light picked up by the light responsive meansis within selected limits.

6. In a device for indicating the genuineness of paper money and thelike, fluorescence test apparatus including a small wave length ultraviolet light source of a wave length of about 3650 A.U., means forreceiving the money, means for efiecting relative movement between thelight source and the money receiving means to position a selectedportion of the money in the light of the light source, filter meansassociated with the light source to restrict the wave length of lightemitted, photo cell means for picking up the light reflected from themoney and the fluorescence created on the money by the light source, anarrow band pass filter means positioned between the money and the photocell means and capable of passing only a narrow band of frequencies andwithin the range generated by a genuine piece of paper money when struckby the small wave length ultra violet light, Polaroid screen meanspositioned between the money and the photo cell means, said screen beingturned in its own plane to an angle about from that passing a maximum oflight to the photo cell means, and means associated with the photo cellmeans for indicating the light picked up by the photo cell means.

References Cited in the file of this patent UNITED STATES PATENTS2,032,128 Horsfield Feb. 25, 1936 2,294,775 Edwards et al Sept. 1, 19422,510,347 Perkins June 6, 1950 2,593,206 Short Apr. 15, 1952 2,827,822Timms Mar. 25,

